Linux

Oracle Linux 8 — java-17-openjdk — security and stability fixes — required update — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — java-17-openjdk — security and stability fixes — required update (ELSA-2023-0192)

🟡 Medium   ⏱ 10–30 min  Last verified: 13 August 2022 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2023-0192 Related CVEs: CVE-2023-21843 CVE-2023-21835 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & […]

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Common Problems 120591

Debian 11 – mdadm RAID Degraded and Rebuild Stalled – Safe Recovery

🟠 High   ⏱ 5–30 min  Last verified: 13 August 2022 Affected versions: Debian 11 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & […]

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AlmaLinux 8 — opensm — vulnerability — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — opensm — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALBA-2021:4412 Upstream summary: For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

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Debian 11 — php-pear — multiple vulnerabilities (6 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — php-pear — multiple vulnerabilities (6 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 13 August 2022 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2017-5630 CVE-2018-1000888 CVE-2020-28948 CVE-2020-28949 CVE-2020-36193 CVE-2021-32610 Upstream summary: PECL in the download utility class in the Installer in PEAR Base System v1.10.1 does not validate file types and […]

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Common Problems 117064

Ubuntu 22.04 LTS Time Drift Because NTP Sync Is Inactive

🟡 Medium   ⏱ 5–30 min  Last verified: 13 August 2022 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & Cross-Refs References & Further […]

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Debian 11 — maildrop — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — maildrop — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 13 August 2022 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2005-2655 CVE-2010-0301 Upstream summary: lockmail in maildrop before 1.5.3 does not drop privileges before executing commands, which allows local users to gain privileges via command line arguments. Table […]

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Debian 11 — golang-github-containernetworking-plugins — vulnerability — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — golang-github-containernetworking-plugins — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 13 August 2022 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2020-10749 Upstream summary: A vulnerability was found in all versions of containernetworking/plugins before version 0.8.6, that allows malicious containers in Kubernetes clusters to perform man-in-the-middle (MitM) attacks. A […]

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How to Set Up the ELK Stack on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Set Up the ELK Stack on RHEL 9

The ELK Stack — Elasticsearch, Logstash, and Kibana — is a battle-tested open-source platform for centralizing, parsing, and visualizing log data at scale. Elasticsearch stores and indexes logs, Logstash ingests and transforms them, and Kibana provides a browser-based interface for searching and dashboarding. Running the ELK Stack on RHEL 9 gives you a self-hosted alternative […]

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How to Set Up DRBD Block Replication on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Set Up DRBD Block Replication on Debian 11

Introduction Deploying set up drbd block replication on debian 11 on a Debian 11 Bullseye machine is straightforward thanks to Debian’s policy-compliant packaging. Unlike rpm-based distributions, Debian stores configuration helpers in /etc/default/, uses update-rc.d for older init scripts, and provides dpkg-reconfigure for interactive package configuration. This tutorial stays on the systemd path throughout. Prerequisites Ensure […]

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Debian 11 — openocd — vulnerability — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — openocd — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 13 August 2022 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2018-5704 Upstream summary: Open On-Chip Debugger (OpenOCD) 0.10.0 does not block attempts to use HTTP POST for sending data to 127.0.0.1 port 4444, which allows remote attackers to […]

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